Texas Instruments LMV981MGX

Overview

LMV981MGX from Texas Instruments is a single-channel, rail-to-rail input/output operational amplifier optimized for 1.8-V operation in space-constrained, battery-powered systems. It delivers 1.4-MHz gain bandwidth, 100-µA supply current per channel, 4-mV max input offset voltage, and output swing within 80 mV of rails under 600-Ω load - enabling precision signal conditioning in fitness trackers and wearable sensors.

For engineers reviewing the LMV981MGX datasheet, LMV981MGX pinout, LMV981MGX application, or LMV981MGX equivalent, key selection criteria include its 1.8-V minimum supply, shutdown functionality with 19-µs turnon time, DSBGA-6 package footprint (1.50 mm × 1.30 mm), and guaranteed performance across −40°C to 125°C industrial temperature range.

Technical Context

The LMV981MGX implements a CMOS input stage with rail-to-rail input common-mode range extending 200 mV beyond supplies and rail-to-rail output stage capable of driving 600-Ω loads while maintaining stability with up to 1000-pF capacitive load. Its architecture supports single-supply operation from 1.8 V to 5 V with low quiescent current and high DC gain (101 dB).

Shutdown control is implemented via a dedicated SHDN pin that places the output in high-impedance state and reduces supply current to ≤1 µA. The device exhibits 60-dB CMRR over extended common-mode range and maintains 75-dB PSRR across full supply range, supporting accurate sensing in noisy portable environments.

Key Specifications

Pinout & Package

LMV981MGX is packaged in a 6-pin DSBGA (YZR) with 1.50 mm × 1.30 mm body size and 0.5-mm pitch. This ultra-compact wafer-level chip-scale package supports high-density PCB layouts in wearables and hearing aids.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar op-amp applications.

Compared with TLV9001IDBVR and OPA316IDBVR, LMV981MGX uniquely balances ultra-low power (100 µA), integrated shutdown (19-µs wake-up), and rail-to-rail I/O with extended common-mode range - making it optimal for duty-cycled, space-constrained, single-cell battery systems where both precision and energy efficiency are co-primary requirements.

Availability

LMV981MGX is available at Aetrix Electronics and suitable for battery monitoring, wearable sensor front-ends, and portable audio line driving requiring stable component supply across automotive, industrial, and consumer design cycles.

Supply support for LMV981MGX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and low-power signal chain solutions.

The LMV98x-N series was designed specifically for ultra-low-voltage, space-constrained portable electronics - emphasizing 1.8-V operation, rail-to-rail performance, and shutdown capability for extended battery life in wearables and IoT endpoints.

FAQ

What is the minimum supply voltage for reliable operation of LMV981MGX?

The LMV981MGX is fully specified and guaranteed to operate from 1.8 V to 5 V. At 1.8 V, it maintains 1.4-MHz gain bandwidth, 100-µA supply current, and rail-to-rail output swing within 80 mV of rails under 600-Ω load. Operation below 1.8 V is not characterized and may result in degraded VOS, reduced output drive, or failure to exit shutdown - LMV981MGX must be powered within its rated 1.8–5-V range for compliant performance.

Does LMV981MGX support true single-supply operation with input signals below ground?

Yes. LMV981MGX features an input common-mode voltage range extending 200 mV beyond both supply rails - meaning with V− = 0 V and V+ = 1.8 V, it accepts inputs from −0.2 V to +2.0 V. This allows direct interfacing with bipolar sensors or level-shifted signals without external clamping or biasing networks, preserving accuracy in LMV981MGX-based front-end designs.

What is the maximum capacitive load LMV981MGX can drive without instability?

LMV981MGX is characterized to remain stable driving up to 1000 pF with appropriate layout (short traces, local 100-nF bypass). This specification holds across 1.8–5 V supply and −40°C to 125°C temperature range. Driving >1000 pF requires external isolation resistance or compensation; LMV981MGX does not require added series resistance for standard ADC input capacitance (typically 5–20 pF) or PCB trace capacitance.

How does the shutdown function behave on LMV981MGX, and what is the leakage current in that state?

When the SHDN pin is driven low (<0.55 V at 1.8 V supply), LMV981MGX disables its internal circuitry and places the output in high-impedance state. Supply current drops to ≤1 µA over temperature (≤0.156 µA typical at 25°C). The device exits shutdown within 19 µs after SHDN rises above the turnon threshold (≥1 V at 1.8 V); LMV981MGX resumes full operation with no initialization delay or configuration required.

Is LMV981MGX pin-compatible with other members of the LMV98x-N family?

No. LMV981MGX is the single-channel variant in a 6-pin DSBGA package (YZR), while LMV982-N is dual-channel in 10-pin VSSOP. Pinouts differ completely: LMV981MGX uses pins 1–6 for OUT, −IN, V−, +IN, SHDN, V+, whereas LMV982-N allocates separate channels and dual shutdown pins. Substituting LMV981MGX for LMV982-N or vice versa requires PCB redesign - LMV981MGX is not pin-compatible with any other LMV98x-N variant.